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Physical and chemical indicators of magnesia iron spinel brick
  • Time:Aug 30, 2023
  • Views: 5

  Magnesia Iron Spinel Brick is a high-temperature refractory material composed of a spinel phase composed of magnesium oxide (MgO) and iron oxide (Fe2O3). The following are common physical and chemical indicators of magnesia-iron spinel bricks:

  1、chemical composition:

       1.1 MgO content: usually between 60-85%, the specific content varies according to different manufacturers and products.

  1.2 Fe2O3 content: usually controlled between 5-25%.

  2. Common physical properties:

  2.1 Bulk density: usually between 3.0-3.7 g/cm³, the specific value depends on the formula and production process.

  2.2 Compressive strength: generally between 40-100 MPa, the strength can be adjusted by adding suitable aggregates and binders.

  2.3 Mass Loss: Mass loss tests are performed at elevated temperatures to assess the resistance of bricks to chemical attack.

  2.4 Coefficient of Thermal Expansion: A measure of how much a material expands linearly as it heats up.

  2.5 Load softening temperature: refers to the temperature at which a material begins to soften under a specific load.

  3. Thermal performance:

  3.1 Refractoriness (fire resistance limit): refers to the ability of a material to resist high temperature environments. Magnesia-iron spinel bricks have good refractory properties and can usually be used at high temperatures above 1500°C.

  3.2 Thermal conductivity: Measures the ability of a material to conduct heat. For bricks, it is generally between 1-3 W/m·K.

       Physical and chemical indicators of magnesia-iron spinel bricks produced by zhenjin

Brand Grade
ZJMI ZJMIA
Chemical
Composition
wt(%)
Mgo ≥88 ≥85
Fe,0, 3.5-4.5 3.0-4.0
AlL03 3.5-4.5 ≥8
Sio2 ≤0.8 ≤0.7
cao ≤1.2 ≤1.2
Bulk density(g/cm3) ≥2.97 ≥2.95
Apparent porosity(%) ≤17 ≤17
Normal temperature compressive strength(MPa) ≥70 ≥70
Load softening start temperature (0.2MPa,to.6) ≥1700 ≥1700
Thermal shock stability, times (1100℃, water cooling) ≥10 ≥12

  It should be noted that the specific physical and chemical indicators may vary due to different manufacturers, product specifications and application requirements. Therefore, when selecting and using magnesia-iron spinel bricks, it is recommended to refer to the technical data and technical specification sheets provided by the supplier to ensure that they meet specific engineering needs.

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